Automatic brake-valve device.



' W. v. TURNER. AUTOMATIC BRAKE VALVE DEVICE.

APPLICATION FILED JULY 1, 1911.

1,078,021; Patefited NOV..1\1, 1913.

WITNESSES INVENTOR 4% M ywmw piston 6 is operated and the contacts 8close the motor-supply circuit through the contact fingers 9 so that thecar motors may then be started. I

The piston 6 is preferably constructed with adifl'e'rentiala'rea,'so-that in its seatedposition, only are'duoed areathereof is subject to the train pipe pressure, thus requiring the trainpipe pressure to be built up to a certain degree before the piston isoperated, while in the open positionof the piston, the fulla'rea of thepiston is exposed to train pipe pressure and the piston 6 only movestoclosed position when the train pipe pressure has fallen to a dangerouslylow point.

. It will thus be seen that the car cannot be operated until the trainpipe pressure has been raised to a predetermined degree and also-inrunning, if the train pipe pressure 7 falls too low, the switchautomatically opens and cuts oil current from the car motors so as tocause the car to stop until the train pipe pressure'is restored.

to hold the piston and the switch contacts in open position. It willthus be apparent that if the operator should neglect to open the cut-outcook, the car cannot be started and furthermore he will bewarned thatthe out out cock'is closed, when he turns the-brake.

valve to running position, by the escape of air through the exhaust port18.

At times, it maybe desirable to be able to move a car even when the airpressure 1s depleted, such as-in the case of barn repalrs, or

aqburning car barn, or'the like,.and for, this purpose a'self openingswitch may be provided for closingthe motor circuit independ ently ofthe position of the automatic switch. As shownin Fig. 1 this emergencyswitch may consist of a knife switch 19 adapted to' complete the motorcircuit fromas upon removing his hand from theswitch,

the same automatically opens. Having now described my invention, what Iclaim as new and desire to secure by Letrs' Patent, is: 1

1,. In a fluid pressure brake, thecombina If the cock 15 is'inits'closed position, as, shown. i'n Fig. 2, the piston 6 is open to theexhaust port 18, thus causing the s'prlng 12 I said cut-out cock. 8. Ina fluid pressure brake, the combination with a train pipc, of a devicefor controlling the power-for operating the vehicle, said device beingadapted tocut-ofi' the power upona predetermined reduction in tram pipepressure, and a self-opening switch adapted to be manually closed forv'erated.

3. In a fluid pressure brake, the combination with a train pipe, of anelectric switch for controlling theisupply of current to the car motors,a piston subject to train ipe pressure for operating said switch, an anautomatically opening-switch adapted to be manually operated forsupplying current to the car motors.

4. In a fluid pressure brake, the combination with a train pipe, of anelectric switch for controlling the/supply circuit of the car motors, apiston operating upon a predetermined-reduction in train p1pe pressurefor .for controlling the supply of current to the car motors, and apiston operating at one degree of train pipe pressure for opening and atanother degree of train pipe pressure for closing said switch.

7. In a fluid pressure brake, the combination with a train pipe, a brakevalve, and a cut-out cockfor cutting ofi the train pipe from the brakevalve, of a device for-controlling the 'supplyof power for operating thecar and means for operating said device to cutofi the power in theclosedposition of tion with a train pipe,'a brake valve, and a .cut-outcockfor cuttingofi the train pipe from the brake valve,'of'a device forcontrolling the supply ofpower for operating the car, and means adaptedupon movement of said cut-out cock to the'closed position for operatingsaid device to out or the supply of power. Y

' 9. In a fluid pressure brake, the combination with. a train pipe'and'ab'rake valve, of

opening said switch, and a switch subject to spring pressure fornormally maintaining a switch device operated by the train pipe pressurefor controlling the supply of cur rent for the car operating motors, anda train pipe cut out cock 'adapted'in open'po} sit-ion to connect saidswitch device with the train pipe and in closed positionf-with'th'eatmosphere;

Hlln a fiuidpressnrebi'nkegthe conibina-- tion with a train pipe and,brake valve, of

a. switch device "operated by thetrain pipe" pressure for controllingthesupply of our-' tent for the canoperating motors, and a train pipecut-out cock adapted in open p0 -si-tion,to snpply fluid to 'saldswitchdevice for operat ng the same to close the-motor supply circuit and inclosed position to vent air from said switch'device to thereby efi'ectthe opening of the motor snpplycircuit.

- the cock. p

' ;In.testi1 nony whereof-I have hereunto: set

pressuresof thetrain pipe anda spring'for operating'said switch, and atrain pipe cutoutcock having means adapted in its open position forsupplying fluid at train 'ipe-.

ress'ure to'said pistonand for ventin uid om "said piston 1n the closedposit on of myhnndl WAL'1 ER V. TURNER

